Moss, a nine-year veteran of the force, is on the customary administrative leave that officers take while detectives investigate the shooting. He was involved in a previous shooting on the job, said police spokesman Anthony Guglielmi, who did not have details on that incident.

Guglielmi said officers had stopped a car for a traffic violation on the 3200 block of Cliftmont Avenue, and a man jumped out and ran away. Two officers followed him as he crossed Edison Highway and then into an alley.

One officer reported seeing a gun, and Moss fired at the man, striking him in the hand. No gun, however, was found at the scene. The 26-year-old man, who suffered non-life threatening injuries, has not been charged so his name has not been released.

Guglielmi said the officer has not yet been interviewed, and he does not know how many rounds were fired.

Baltimore Police Commissioner Anthony W. Batts announced Thursday a broad reshuffling of the agency's command staff, with new leadership for four patrol districts and the homicide unit, as well as the creation of units focused on community relations and gangs.